Structure and properties of Al-Mg mechanical alloys

Document Type

Article

Publication Date

1-1-2003

Abstract

Mechanically alloys in the Al-Mg binary system in the range of 5-50 at.% Mg were produced for prospective use as metallic additives for propellants and explosives. Structure and composition of the alloys were characterized by x-ray diffraction microscopy (XRD) and scanning electron microscopy. The mechanical alloys consisted of a supersaturated solid solution of Mg in the α aluminum phase, γ phase (Al12Mg17), and additional amorphous material. The strongest supersaturation of Mg in the α phase (20.8%) was observed for bulk Mg concentrations up to 40%. At 30% Mg, the γ phase formed in quantities detectable by XRD; it became the dominating phase for higher Mg concentrations. No β phase (Al3Mg2) was detected in the mechanical alloys. The observed Al solid solution generally had a lower Mg concentration than the bulk composition. Thermal stability and structural transitions were investigated by differential scanning calorimetry. Several exothermic transitions, attributed to the crystallization of β and γ phases were observed. The present work provides the experimental basis for the development of detailed combustion and ignition models for these novel energetic materials.

Identifier

0141502503 (Scopus)

Publication Title

Journal of Materials Research

External Full Text Location

https://doi.org/10.1557/JMR.2003.0255

ISSN

08842914

First Page

1827

Last Page

1836

Issue

8

Volume

18

Grant

N00014-00-1-0446

Fund Ref

Office of Naval Research

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